Elevated hero in Scotland knows devil (7)
I believe the answer is:
dickens
'devil' is the definition.
(I know that devil can be written as dickens)
'elevated hero in scotland knows' is the wordplay.
'elevated' says the letters should be written backwards (in a down clue, letters go up).
'hero' becomes 'cid' (El Cid, Spanish military hero).
'in scotland knows' becomes 'kens' (ken is a Scottish word meaning understand).
'cid' written backwards gives 'dic'.
'dic'+'kens'='DICKENS'
(Other definitions for dickens that I've seen before include "Author of Our Mutual Friend, d. 1870" , "Oliver Twist author" , "Charles - - , novelist" , "writer" , "English novelist" .)